/****************************************************************************
 * arch/arm/src/am335x/am335x_pinmux.c
 *
 *   Copyright (C) 2018 Petro Karashchenko. All rights reserved.
 *   Author: Petro Karashchenko <petro.karashchneko@gmail.com>
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 * 3. Neither the name NuttX nor the names of its contributors may be
 *    used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 ****************************************************************************/

/****************************************************************************
 * Included Files
 ****************************************************************************/

#include <nuttx/config.h>

#include <sys/types.h>
#include <stdint.h>
#include <assert.h>
#include <errno.h>

#include "arm_arch.h"
#include "am335x_pinmux.h"

/****************************************************************************
 * Public Functions
 ****************************************************************************/

/****************************************************************************
 * Name: am335x_pinmux_configure
 *
 * Description:
 *   This function writes the encoded pad configuration to the Pad Control
 *   register.
 *
 ****************************************************************************/

int am335x_pinmux_configure(uintptr_t padctl, pinmux_pinset_t muxset)
{
  uint32_t regval = 0;
  uint32_t value;

  /* Select mux mode */

  value = (muxset & PINMUX_MODE_MASK) >> PINMUX_MODE_SHIFT;
  regval |= PADCTL_MUXMODE(value);

  /* Select pull up/down type */

  if ((muxset & PINMUX_PULL_TYPE_UP) != 0)
    {
      regval |= PADCTL_PULLUP_EN;
    }

  /* Select pull up/down enable */

  if ((muxset & PINMUX_PULL_UP_DISABLE) != 0)
    {
      regval |= PADCTL_PULLUDDIS;
    }

  /* Select receive enable */

  if ((muxset & PINMUX_RX_ENABLE) != 0)
    {
      regval |= PADCTL_RXACTIVE;
    }

  /* Select slow/fast slew rate */

  if ((muxset & PINMUX_SLEW_SLOW) != 0)
    {
      regval |= PADCTL_SLEWCTRL;
    }

  /* Write the result to the specified Pad Control register */

  putreg32(regval, padctl);
  return OK;
}
